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Добірка наукової літератури з теми "Oxide composite"

Автор: Grafiati
Опубліковано: 11 січня 2025

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Статті в журналах з теми "Oxide composite"

1

Sugianto, Sugianto, Ngurah Made Dharma Putra, Endah F. Rahayu, Wahyu B. Widayatno, Cherly Firdharini, Slamet Priyono, and Didik Aryanto. "Synthesis, Characterization, and Electrochemical Performance of Reduced Graphene Oxide-Metal (Cu,Zn)-Oxide Materials." Indonesian Journal of Science and Technology 8, no. 2 (March 10, 2023): 329–44. http://dx.doi.org/10.17509/ijost.v8i2.56065.

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The reduced graphene oxide (rGO) and metal (Cu,Zn)-oxide composites were prepared using a one-step hydrothermal technique. The role of (Cu,Zn)-oxide on the physical and electrochemical properties of the composite was investigated. The composite consists of various shapes of ZnO nanoflowers and micro-spheres, as well as Cu-oxide nanoflakes and octahedron-like shapes. The (Cu,Zn)-oxides were formed in between the rGO layers and observed in the rGO-ZnO, rGO-CuO, and rGO-CuO-ZnO composites. The presence of ZnO, CuO, and rGO within the composite structure is also confirmed by the analyses of crystal structure, microstructure, and surface functional groups. Some excess impurities remaining from the surfactant give considerable differences in the electrochemical performance of the composites. The specific capacitance values of the rGO, rGO-ZnO, rGO-CuO, rGO-(0.5CuO-0.5ZnO), and rGO-(0.25CuO-0.75ZnO) composites are 9.32, 58.53, 54.14, 25.21, and 69.27 F/g, respectively. The formation ofa double metal-oxide structure as well as their insertion into the rGO sheet can significantly improve the electrochemical properties of the supercapacitor.
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2

Matveev, E. S. "Composite Solid Electrolytes." Membrany i membrannye tehnologii 14, no. 4 (November 27, 2024): 263–75. http://dx.doi.org/10.31857/s2218117224040027.

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The review describes composite electrolytes based on classical salt matrix phases, and also shows the possibilities of creating composites using simple or complex oxide matrices, where simple substances, salts, simple and complex oxides are used as heterogeneous dopant. The magnitude of the composite effect of electrical conductivity is discussed from the point of view of various theories of its quantitative description. The reasons for the occurrence of the composite effect are summarized. The effect of increasing ionic conductivity is due to the disorder of the surface layer in the intergranular space, amorphization or spreading of the matrix phase or the phase of heterogeneous dopant over the surface of the other phase due to the difference in surface energy, as well as the possibility of joint manifestation of these effects when using complex oxide eutectic composites with treatment above the temperature of the eutectic system.
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3

Liang, Yong-Xin, Ze-Rong Ma, Si-Ting Yu, Xin-Yue He, Xu-Yang Ke, Ri-Feng Yan, Xiao-Xian Liang, et al. "Preparation and property analysis of solid carbonate-oxide composite materials for an electrolyte used in low-temperature solid oxide fuel cell." Science and Technology for Energy Transition 77 (2022): 4. http://dx.doi.org/10.2516/stet/2022003.

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The oxide-carbonate composite electrolyte material with high ionic conductivity at low temperature has been thought that it can be used to develop LT-SOFC. However, the carbonate composite electrolyte is not easy to make it dense, especially mixing and packing oxide and carbonate to fabricate the composite electrolyte simply. In this article, rare-earth-doped CeO2 (RDC) (R = La, Sm, Gd, and Gd + Y) series samples were prepared by wet ball-milling, then sintered into fully dense and porous oxide bulk at 1500–1600 °C and 1000 °C. Melted carbonate LNCO, composed of Li2CO3 and Na2CO3 at a molar ratio of 1:1, was combined with porous oxide bulk materials using a bath method at 500 °C for 10 h to prepare a dense carbonate-oxide composite electrolyte. The dense oxide-carbonate composite electrolyte always obtains by this fabrication process. Boiling water was used to remove carbonate from these composites. Lattice parameters were obtained through Rietveld refinement, and a calculation procedure for quantifying the composite density was proposed. The quantified composite density results were verified through scanning electron microscopy microstructure observations. The Ce valence in the RDC oxides and RDC-carbonate composite was analyzed by X-ray absorption near edge structure spectroscopy to observe the effects of heat treatment temperature and carbonate on the Ce4+/Ce3+ mixed-valence state in doped CeO2.
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4

Zhu, Chenkai, Lei Nie, Xiaofei Yan, Jiawei Li, and Dongming Qi. "Ramie fiber reinforced composites with flame retardant structure design: flammability, smoke suppression, and mechanical properties." Journal of Polymer Engineering 42, no. 1 (November 29, 2021): 9–17. http://dx.doi.org/10.1515/polyeng-2021-0221.

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Abstract In this work, the structure of composite was designed as Core Stack and Surface Stack, which was treated with the expandable graphite (EG) and metal oxides such as iron oxide (IO), hydroxyapatite (HA), and aluminum tri-hydroxide (ATH). The mechanical performance of composites was characterized via flexural performance and interlaminar shear strength analysis. The flame retardance and smoke suppression of composite was explored in detail by LOI, UL-94, and cone calorimeter test. The findings presented that flexural properties of composites were observed to decrease due to delamination of surface stack, whilst no significant effect on interlaminar shear strength. In comparison with control composite, the loading of metal oxide into composite Surface Stack led to the reduction of peak heat release rate, total heat release, and fire growth index effectively. Moreover, the remarkable decrease in total smoke production could be observed due to the addition of iron oxide and the flame retardant mechanism was discussed. This study was the preliminary exploration of composite with flame retardant design which could be potential solution to improve flame retardancy and smoke suppression of composite with better mechanical structure preservation.
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Singh, Tej, Chandramani Goswami, Amar Patnaik, and László Lendvai. "Optimal Design of Ceramic Based Hip Implant Composites Using Hybrid AHP-MOORA Approach." Materials 15, no. 11 (May 26, 2022): 3800. http://dx.doi.org/10.3390/ma15113800.

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Designing excellent hip implant composite material with optimal physical, mechanical and wear properties is challenging. Improper hip implant composite design may result in a premature component and product failure. Therefore, a hybrid decision-making tool was proposed to select the optimal hip implant composite according to several criteria that are probably conflicting. In varying weight proportions, a series of hip implant composite materials containing different ceramics (magnesium oxide, zirconium oxide, chromium oxide, silicon nitride and aluminium oxide) were fabricated and evaluated for wear and physicomechanical properties. The density, void content, hardness, indentation depth, elastic modulus, compressive strength, wear, and fracture toughness values were used to rank the hip implant composites. It was found that the density and void content of the biocomposites remain in the range of 3.920–4.307 g/cm3 and 0.0021–0.0089%, respectively. The composite without zirconium oxide exhibits the lowest density (3.920 g/cm3), while the void content remains lowest for the composite having no chromium oxide content. The highest values of hardness (28.81 GPa), elastic modulus (291 GPa) and fracture toughness (11.97 MPa.m1/2) with the lowest wear (0.0071 mm3/million cycles) were exhibited by the composites having 83 wt.% of aluminium oxide and 10 wt.% of zirconium oxide. The experimental results are compositional dependent and without any visible trend. As a result, selecting the best composites among a group of composite alternatives becomes challenging. Therefore, a hybrid AHP-MOORA based multi-criteria decision-making approach was adopted to choose the best composite alternative. The AHP (analytic hierarchy process) was used to calculate the criteria weight, and MOORA (multiple objective optimisation on the basis of ratio analysis) was used to rank the composites. The outcomes revealed that the hip implant composite with 83 wt.% aluminium oxide, 10 wt.% zirconium oxide, 5 wt.% silicon nitride, 3 wt.% magnesium oxide, and 1.5 wt.% chromium oxide had the best qualities. Finally, sensitivity analysis was conducted to determine the ranking’s robustness and stability concerning the criterion weight.
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Aphesteguy, Juan C., and Silvia E. Jacobo. "Preparation and Characterization of Nanocomposites for Technological Applications." Solid State Phenomena 202 (May 2013): 97–111. http://dx.doi.org/10.4028/www.scientific.net/ssp.202.97.

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Materials with both electrical and magnetic properties are required for various applications ranging from electric and magnetic shields, molecular electronics, and sensors to microwave absorbers. Conducting polymers with the addition of magnetic oxides composites are suitable for such uses. Such is the case of the polyaniline (PANI), an organic polymer, mixed with magnetite. We have prepared through a new chemical method a PANI/ Fe3O4 composite with different amount of magnetic oxide from 0.3% m/m on the composite up to 42% m/m. The final product is a powder with good solubility in some organic solvents as chloroform. Structural morphological studies, transport properties (the electrical conductivity as a function of temperature) and magnetic characterization were performed on the oxides, on PANI and on the composites. We have explored the answer of these composites as absorbers in the microwave region to determine its potential technological application. An interesting magnetoresistance (MR) behavior was observed. The results are related to the particle size and to the influence of the percentage of oxide in the composite.
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HO, M. Y., P. S. KHIEW, D. ISA, T. K. TAN, W. S. CHIU, and C. H. CHIA. "A REVIEW OF METAL OXIDE COMPOSITE ELECTRODE MATERIALS FOR ELECTROCHEMICAL CAPACITORS." Nano 09, no. 06 (August 2014): 1430002. http://dx.doi.org/10.1142/s1793292014300023.

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Анотація:
With the emerging technology in the 21st century, which requires higher electrochemical performances, metal oxide composite electrodes in particular offer complementary properties of individual materials via the incorporation of both physical and chemical charge storage mechanism together in a single electrode. Numerous works reviewed herein have identified a wide variety of attractive metal oxide-based composite electrode material for symmetric and asymmetric electrochemical capacitors. The focus of the review is the detailed literature data and discussion regarding the electrochemical performance of various metal oxide composite electrodes fabricated from different configurations including binary and ternary composites. Additionally, projection of future development in hybrid capacitor coupling lithium metal oxides and carbonaceous materials are found to obtain significantly higher energy storage than currently available commercial electrochemical capacitors. This review describes the novel concept of lithium metal oxide electrode materials which are of value to researchers in developing high-energy and enhanced-cyclability electrochemical capacitors comparable to Li -ion batteries. In order to fully exploit the potential of metal oxide composite electrode materials, developing low cost, environment-friendly nanocomposite electrodes is certainly a research direction that should be extensively investigated in the future.
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8

Chausov, Denis N., Veronika V. Smirnova, Dmitriy E. Burmistrov, Ruslan M. Sarimov, Alexander D. Kurilov, Maxim E. Astashev, Oleg V. Uvarov, et al. "Synthesis of a Novel, Biocompatible and Bacteriostatic Borosiloxane Composition with Silver Oxide Nanoparticles." Materials 15, no. 2 (January 11, 2022): 527. http://dx.doi.org/10.3390/ma15020527.

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Microbial antibiotic resistance is an important global world health problem. Recently, an interest in nanoparticles (NPs) of silver oxides as compounds with antibacterial potential has significantly increased. From a practical point of view, composites of silver oxide NPs and biocompatible material are of interest. A borosiloxane (BS) can be used as one such material. A composite material combining BS and silver oxide NPs has been synthesized. Composites containing BS have adjustable viscoelastic properties. The silver oxide NPs synthesized by laser ablation have a size of ~65 nm (half-width 60 nm) and an elemental composition of Ag2O. The synthesized material exhibits strong bacteriostatic properties against E. coli at a concentration of nanoparticles of silver oxide more than 0.01%. The bacteriostatic effect depends on the silver oxide NPs concentration in the matrix. The BS/silver oxide NPs have no cytotoxic effect on a eukaryotic cell culture when the concentration of nanoparticles of silver oxide is less than 0.1%. The use of the resulting composite based on BS and silver oxide NPs as a reusable dry disinfectant is due to its low toxicity and bacteriostatic activity and its characteristics are not inferior to the medical alloy nitinol.
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9

Kaya, Cengiz. "Current Status of Oxide Fibre-Reinforced Oxide Ceramic Matrix Composites for Gas Turbine Applications." Key Engineering Materials 434-435 (March 2010): 1–4. http://dx.doi.org/10.4028/www.scientific.net/kem.434-435.1.

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Recent developments in the processing, understanding and mechanical/thermomechanical properties of oxide fibre reinforced oxide ceramic matrix composites for high temperature applications are reported. Two dimensional composite plates and uni-directional tubular composite (so called mini-composite) specimens are successfully manufactured and their microstructure, matrix/ fiber interface as well as mechanical properties are examined. It is shown that the microstructural variations, such as porosity size and interface between fibre and matrix determine the fracture behaviour and high temperature performance of the composites. The optimised components produced are considered to be suitable for gas turbine applications.
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Joshi, P. S., and D. S. Sutrave. "Study of Ruthenium Oxide, Manganese Oxide and Composite (Ru:Mn)O2 thin film Electrodes Assembled by Layer by Layer Spin Coating Method." Material Science Research India 13, no. 1 (June 6, 2016): 43–49. http://dx.doi.org/10.13005/msri/130107.

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Ruthenium oxide, Manganese oxide and (Ru:Mn)O2 composite thin films have been prepared by 0.02M Ruthenium chloride and Manganese acetate solutions respectively on stainless steel substrates by sol-gel spin coating method. Layer by layer deposition of RuO2 and MnO2 was done for composite films. RuO2: MnO2 composite thin films have been demonstrated to be an excellent material for Supercapacitor application when evaluated with RuO2 and MnO2 thin film electrodes with respect to XRD, SEM, CV, CP and EIS studies. As a result, high specific capacitance of 515 F/g at 10 mV/s with excellent stability and long cycle life was obtained, where specific power and energy were as high as 15.38 Wh/kg and 4.06 KW/kg respectively with loading weight of 0.13 mg/cm2 .Composite films showed changes in structural and morphological features which was admiring for supercapacitor applications. The electrochemical impedance measurement was carried out in 0.1M KOH in the frequency range 10 to 105 Hz. From the analysis it can be concluded that mixed oxide composites have superior capacitive performance to single transition metal oxides as electrodes.
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Більше джерел

Дисертації з теми "Oxide composite"

1

Li, Wei. "Composite polymer/graphite/oxide electrode systems for supercapacitors." University of Cincinnati / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1439309266.

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2

Creaser, Dale Abel. "Aspects of composite lanthanide oxide chemistry." Thesis, University of Nottingham, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334547.

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3

Saintonge, Arnaud. "Élaboration d’un composite oxyde/oxyde à matrice d'aluminosilicate de baryum et fibres d'alumine." Electronic Thesis or Diss., Bordeaux, 2024. http://www.theses.fr/2024BORD0243.

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Dans l’industrie de l’aéronautique et de la défense, les applications thermostructurales nécessitent des matériaux toujours plus performants, alliant résistance mécanique, réfractarité et légèreté. Pour répondre à ces exigences, les matériaux composites à matrice céramique tout oxyde (OCMC) sont prometteurs. Parmi les matrices de ces OCMC, l'aluminosilicate de baryum (BAS) se distingue par ses propriétés physiques intéressantes, notamment en tant que matériau pour radômes. Cependant, pour rendre ce matériau fonctionnel à haute température, proche de sa température de fusion (1750°C), il est essentiel de le renforcer avec un matériau thermochimiquement stable et doté d'une architecture adaptée. Plusieurs thèses antérieures ont permis de maîtriser la phase hexagonale du BAS. La nature chimique du renfort présentant la stabilité souhaitée avec le BAS a été identifiée et des OCMC Al2O3/BAS à renfort fibreux 1D, 2D ont commencé à être élaborés. Toutefois, pour obtenir des matériaux ayant des propriétés accrues pour des conditions thermostructurales sévères, il est nécessaire de réaliser ces OCMC avec une architecture « 3D » du renfort. Le sujet présenté porte sur la réalisation d'un tel composite avec une architecture complexe (3D) du renfort fibreux et sur l'évaluation de ses propriétés. Pour répondre à cet objectif, ces travaux de recherche incluent : l'étude du frittage du BAS-H afin d’anticiper son comportement en tant que matrice, l'amélioration de son comportement rhéologique en suspension afin de favoriser son infiltration dans une préforme de renforts fibreux, et la mise en place d'un procédé d'imprégnation adapté aux renforts 3D. À la suite de ces études, la fabrication d'OCMC Al2O3/BAS a été réalisée, mettant en évidence des caractéristiques prometteuses en lien avec l'application
In the aerospace and defense industry, thermostructural applications require increasingly high-performance materials, combining mechanical strength, refractoriness, and lightness. To meet these demands, all-oxide ceramic matrix composites (OCMC) are considered promising candidates. Among the matrices for these OCMCs, barium aluminosilicate (BAS) stands out due to its advantageous physical properties, particularly as a material for radomes. However, to make this material functional at high temperatures, close to its melting point (1750°C), it is essential to reinforce it with a thermochemically stable material that has an appropriate architecture. Previous theses have successfully mastered the hexagonal phase of BAS. The chemical nature of the reinforcement, which offers the desired stability with BAS, has been identified, and OCMC Al2O3/BAS composites with 1D and 2D fibrous reinforcements have been developed. However, to achieve materials with enhanced properties under severe thermostructural conditions, these OCMCs need to be produced with a "3D" reinforcement architecture. This work focuses on the development of such a composite with a complex (3D) fiber reinforcement architecture and the evaluation of its properties. To achieve this, the research involves studying the sintering of BAS-H to predict its behavior as a matrix, improving its rheological behavior in suspension to facilitate infiltration into the fibrous reinforcement preform, and implementing an impregnation process suitable for 3D reinforcements. Following these studies, the fabrication of OCMC Al2O3/BAS was completed, demonstrating promising characteristics for the intended application
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4

Joshi, Sharmad Vinod. "Characterization of 3D printed metal oxide composite polymers." Miami University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=miami1595511295182678.

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5

Milsom, Elizabeth Victoria. "Metal oxide-organic nano-composite and mesoporous oxide films : fundamental properties and applications." Thesis, University of Bath, 2007. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.441523.

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6

Dearn, Sophie Clare. "Development of a novel oxide-oxide ceramic matrix composite for high temperature structural applications." Thesis, University of Birmingham, 2015. http://etheses.bham.ac.uk//id/eprint/5924/.

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The introduction of ceramic matrix composites (CMCs) for structural applications in the hot section of a gas turbine provides many potential benefits over conventional alloy materials, including facilitating elevated operating temperatures. The development of an oxide-oxide CMC composed of commercially available Nextel 720 (3M) fibres within a porous alumina matrix was presented. A simple, low cost processing method involving slurry impregnation and subsequent consolidation and densification was developed, facilitating the production of dried pre-impregnated fabric (‘pre-preg’) that can be stored in ambient conditions. Detailed investigation into the effect of three types of PVA binder, the effect of 0-20wt% additions of an alumina precursor (ACH), the influence of a bimodal particle distribution and the effect of sintering at temperatures between 1100 and 1300°C on processing and mechanical properties was completed in order to optimise the material. The optimised composite material, composed of Nextel 720 fibres within a submicron alumina particle matrix with 10wt% ACH sintered at 1200°C, exhibited mean flexural strength >205MPa, short beam shear strength >12MPa and tensile strength >146MPa. These results were comparable to similar oxide CMCs previously reported, validating this material.
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7

Ricca, Chiara. "Combined theoretical and experimental study of the ionic conduction in oxide-carbonate composite materials as electrolytes for solid oxide fuel cells (SOFC)." Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066623/document.

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Les composites oxyde-carbonate pourraient constituer des électrolytes pour les SOFC fonctionnant entre 400-600°C car ils attendent une conductivité de 0,1 S/cm à 600°C. Une meilleure compréhension de l'origine de leurs performances est à ce jour nécessaire. Pour y parvenir, une approche combinée théorique et expérimentale a été développée. La conductivité, mesurée à travers la SIE, a été étudiée en fonction de la phase oxyde ou carbonate et de l'atmosphère de travail. Les résultats sur les composite de CeO2 ou YSZ ont montré que seule l'interface peut expliquer des observations surprenantes. De la réactivité a été observée dans le cas des composites à base de TiO2. On a donc proposé une stratégie computationnelle qui utilise des calculs DFT périodiques: la structure du bulk de chaque phase a d'abord été étudiée afin de trouver un bon protocole computationnel, qui a été ensuite utilisé pour identifier un modèle pour la surface la plus stable des deux phases. Ces modèles de surfaces ont donc été combinés pour obtenir un modèle de l'interface oxyde-carbonate, utilisable comme structure de départ pour des calculs DFT et de DM. Cette stratégie a permis d'obtenir des informations sur structure, stabilité et propriétés électroniques des composites. YSZ-LiKCO3 a été utilisé pour mieux comprendre l'effet des interfaces sur le transport de différentes espèces, tandis que le modèle de l'interface entre TiO2 et LiKCO3 a été utilisé pour étudier la réactivité entre ces deux matériaux. Finalement, ces résultats ouvrent la voie vers une plus grande compréhension des principes de fonctionnement des SOFC basées sur les électrolytes composites oxyde-carbonate
Oxide-carbonate composites are promising electrolytes for LT-SOFC, thanks to their high conductivity (0.1-1 S/cm at 600°C). A deeper understanding on the origins of their improved performances is still necessary. For this purpose, a combined theoretical and experimental approach was developed. We first studied systematically the conductivity of the material, measured through EIS, as a function of different oxide or carbonate phases and of the operating atmosphere. Results on YSZ- and CeO2-based materials indicate that by only taking into account the interfaces it is possible to rationalize some surprising observations, while reactivity issues have been observed for TiO2-carbonate composites. We then proposed a computational strategy based on periodic DFT calculations: we first studied the bulk structure of each phase so as to select an adequate computational protocol, which has then been used to identify a suitable model of the most stable surface for each phase. These surface models have thus been combined to obtain a model of the oxide-carbonate interface that through static DFT and MD provides a deeper insight on the interface at the atomic level. This strategy was applied to provide information on the structure, stability and electronic properties of the interface. YSZ-LiKCO3 was used as a case study to investigate the conduction mechanisms of different species. Results showed a strong influence of the interfaces on the transport properties. The TiO2-LiKCO3 model was, instead, used to investigate the reactivity of these materials. Overall, these results pave the way toward a deeper understanding of the basic operating principles of SOFC based on these materials
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8

Besnard, Clémence. "Elaboration de composites céramiques oxyde/oxyde par caléfaction." Thesis, Bordeaux, 2019. http://www.theses.fr/2019BORD0162/document.

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Анотація:
De manière générale, les composites oxyde/oxyde sont la plupart du temps élaborés par frittage, par voie sol-gel ou par infiltration en phase gazeuse, CVI (« Chemical vapor infiltration »). Ces techniques d’élaboration comportent de nombreuses étapes engendrant un temps long d’élaboration ce qui peut entraîner une détérioration des propriétés du composite. Cette thèse s’intéresse à un procédé original et rapide de densification de préformes fibreuses développé par le Commissariat à l’Energie Atomique et aux énergies alternatives (CEA) : la caléfaction. Ce procédé est connu pour élaborer des composites C/C ou C/SiC à partir d’un précurseur liquide. Cependant, la possibilité d’élaborer des composites oxyde/oxyde n’a jamais été testée. L’objectif de ce travail est d’étudier la réalisation de composites oxydes/oxydes par ce procédé. Plusieurs matrices ont été réalisées telles que la silice, l’alumine et le système ternaire aluminosilicate de baryum, BaSi2Al2O8. Plusieurs paramètres expérimentaux ont été étudiés tels que la température d’élaboration, le temps de manipulation et la composition du précurseur. Des caractérisations microstructurales et physico-chimiques ont permis de caractériser les matériaux élaborés. Plusieurs modifications ont été apportées au montage expérimental afin de permettre une meilleure reproductibilité des essais et un meilleur suivi thermique lors de l’élaboration de matrice oxyde
Nowadays, oxide/oxide composites are most of the time developed by sintering, sol-gel process or CVI (Chemical Vapor Infiltration). These techniques include many steps of synthesis leading to a long time of synthesis and possible deteriorations of the properties of the composite. This thesis focuses on an original and rapid process developed by French Alternative Energies and Atomic Energy Commission (CEA): the film boiling chemical vapor infiltration. This technique is already used to synthesize C/C and C/SiC composites but works have never focused on oxide/oxide composites. The main goal of this thesis is to synthesize oxide/oxide composites by film boiling chemical vapor infiltration. Works were focused on alumina, silica and barium aluminosilicate matrices. Several experimental parameters were studied: temperature, time and liquid precursor. Microstructural and physicochemical characterizations were done on composites. Several modifications of the experimental setup have been made in order to allow a better reproducibility of the tests and a better thermal monitoring
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9

Sivasundram, Gopiraj. "Composite cathodes for intermediate temperature solid oxide fuel cells." Thesis, Imperial College London, 2006. http://hdl.handle.net/10044/1/11518.

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10

Dharmadasa, Ruvini. "Studies of composite metal oxide based ETA solar cells." Thesis, Loughborough University, 2011. https://dspace.lboro.ac.uk/2134/9117.

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The drive to produce low cost and efficient solar cells to replace solid state silicon cells has led to the rapid growth of nanotechnology in the PV sector. The extremely thin absorber (ETA) layer solar cell is a device that relies on the use of nanostructured anodes. The very high surface area of the metal oxides enhances the efficiency of the devices by increasing light harvesting in the cell. TiO2 has been the most common material of choice in these cells. However, alternative materials such as composite electrodes ZnO/TiO2, ZnO/SnO2, ZnO/Al2O3 have been considered. These systems also have the ability to improve charge carrier separation and broaden their photoresponse region. In addition to selecting materials with the correct energetics, the morphology of the metal oxide particles plays an important role in these devices. The ability to manipulate the shape, size, and surface to volume ratio of these oxides is critical in influencing the materials chemical, electronic and optical properties. In this thesis the fabrication of composite (ZnO,SnO2) electrodes by aerosol assisted chemical vapor deposition (AACVD) was investigated. By simply varying the Zn:Sn ratio in the precursor solution, a range of (ZnO,SnO2) composite materials along with single phase ZnO and SnO2 has been fabricated. It has been found that the morphology of the deposited electrodes is highly dependent on the Zn content with electrodes with morphologies ranging from nanoplates, to nanocolumns, to highly compact structures have been deposited. The dependence of the Zn content in the deposition solution on the photoelectrochemical (PEC), optoelectronic, photon to electron conversion efficiency (APCE) and photovoltaic characterization was investigated. ETA solar cells with FTO/(ZnO,SnO2)/In2S3/PbS/PEDOT:PSS/Cgraphite/FTO structures were successfully fabricated to demonstrate the suitability of (ZnO,SnO2) anodes in these devices. This work has shown that AACVD is a useful technique for engineering the properties of semiconducting electrodes for PV applications.
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Книги з теми "Oxide composite"

1

Pearce, David Henry. Fabrication and evaluation of an oxide-oxide ceramic matrix composite. Birmingham: University of Birmingham, 1996.

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O, Book Patricia, DellaCorte Christopher, and United States. National Aeronautics and Space Administration., eds. Sliding wear of self-mated AlO□-□SiC whisker reinforced composites at 23-1200 C̊. [Washington, DC]: National Aeronautics and Space Administration, 1991.

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O, Book Patricia, DellaCorte Christopher, and United States. National Aeronautics and Space Administration., eds. Sliding wear of self-mated AlO-SiC whisker reinforced composites at 23-1200 C̊. [Washington, DC]: National Aeronautics and Space Administration, 1991.

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4

O, Book Patricia, DellaCorte Christopher, and United States. National Aeronautics and Space Administration., eds. Sliding wear of self-mated AlO-SiC whisker reinforced composites at 23-1200 C̊. [Washington, DC]: National Aeronautics and Space Administration, 1991.

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5

Hameed, Abdulrahman Shahul. Phosphate Based Cathodes and Reduced Graphene Oxide Composite Anodes for Energy Storage Applications. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-2302-6.

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6

P, Shapiro A., and United States. National Aeronautics and Space Administration., eds. Magnesium-aluminum-zirconium oxide amorphous ternary composite: A dense and stable optical coating. [Washington, D.C: National Aeronautics and Space Administration, 1998.

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P, Shapiro A., and United States. National Aeronautics and Space Administration., eds. Magnesium-aluminum-zirconium oxide amorphous ternary composite: A dense and stable optical coating. [Washington, D.C: National Aeronautics and Space Administration, 1998.

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8

P, Shapiro A., and United States. National Aeronautics and Space Administration., eds. Magnesium-aluminum-zirconium oxide amorphous ternary composite: A dense and stable optical coating. [Washington, D.C: National Aeronautics and Space Administration, 1998.

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9

P, Shapiro A., and United States. National Aeronautics and Space Administration., eds. Magnesium-aluminum-zirconium oxide amorphous ternary composite: A dense and stable optical coating. [Washington, D.C: National Aeronautics and Space Administration, 1998.

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10

International, Conference on Advanced Ceramics and Composites (29th 2005 Cocoa Beach Fla ). Advances in solid oxide fuel cells: A collection of papers presented at the 29th International Conference on Advanced Ceramics and Composites, January 23-28, 2005, Cocoa Beach, Florida. Westerville, Ohio: American Ceramic Society, 2005.

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Частини книг з теми "Oxide composite"

1

Gudarzi, Mohsen Moazzami, Seyed Hamed Aboutalebi, and Farhad Sharif. "Graphene Oxide-Based Composite Materials." In Graphene Oxide, 314–63. Chichester, UK: John Wiley & Sons, Ltd, 2016. http://dx.doi.org/10.1002/9781119069447.ch10.

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Paipetis, A., and V. Kostopoulos. "Ultrasonic Stiffness Matrix Measurements of Oxide/Oxide Composites." In Recent Advances in Composite Materials, 167–80. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-017-2852-2_14.

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Matsuura, Takeshi. "Reverse Osmosis and Nanofiltration by Composite Polyphenylene Oxide Membranes." In Polyphenylene Oxide and Modified Polyphenylene Oxide Membranes, 181–212. Boston, MA: Springer US, 2001. http://dx.doi.org/10.1007/978-1-4615-1483-1_6.

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4

Singh, Surendra. "Pulp and Paper Wastewater Treatment by Composite Polyphenylene Oxide Membranes." In Polyphenylene Oxide and Modified Polyphenylene Oxide Membranes, 213–29. Boston, MA: Springer US, 2001. http://dx.doi.org/10.1007/978-1-4615-1483-1_7.

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5

Dorey, Robert, Subhasis Roy, A. Sharma, Chandan Ghanty, and Subhasish B. Majumder. "Composite Film Processing." In Chemical Solution Deposition of Functional Oxide Thin Films, 445–82. Vienna: Springer Vienna, 2013. http://dx.doi.org/10.1007/978-3-211-99311-8_19.

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6

Kostopoulos, V., and D. E. Vlachos. "Long Term Behaviour of Continuous Fiber Oxide/Oxide Composites Under Thermal Exposure." In Recent Advances in Composite Materials, 215–26. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-017-2852-2_18.

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7

Revcolevschi, Alexandre. "Nickel Oxide - Based Aligned Eutectics." In Tailoring Multiphase and Composite Ceramics, 115–30. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4613-2233-7_10.

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8

Lehmann, J., and G. Ziegler. "Oxide-Based Ceramic Composites." In Developments in the Science and Technology of Composite Materials, 425–34. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0787-4_58.

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9

Kaur, Gurbinder. "Mixed Alkaline/Composite Glasses and Coated Interconnects." In Solid Oxide Fuel Cell Components, 261–314. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-25598-9_7.

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10

Wu, M. K., B. H. Loo, P. N. Peters, and C. Y. Huang. "High-Temperature Processing of Oxide Superconductors and Superconducting Oxide—Silver Oxide Composite." In ACS Symposium Series, 181–93. Washington, DC: American Chemical Society, 1988. http://dx.doi.org/10.1021/bk-1988-0377.ch015.

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Тези доповідей конференцій з теми "Oxide composite"

1

Lee, Changkyun, Jiawei Song, Haiyan Wang, Jie Zhu, Vidisha Singhal, and Peter Bermel. "Temperature-dependent optical dispersion of composite oxide multilayers." In Nonimaging Optics: Efficient Design for Illumination and Concentration XIX, edited by Lun Jiang, Roland Winston, Håkon Jarand Dugstad Johnsen, and Thomas A. Cooper, 13. SPIE, 2024. http://dx.doi.org/10.1117/12.3029039.

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2

Xie, X. H., X. R. Yan, J. Xie, and S. Y. Liu. "Composite oxide powders." In Third International Conference on Smart Materials and Nanotechnology in Engineering. SPIE, 2012. http://dx.doi.org/10.1117/12.916768.

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3

Razzell, Anthony G., Ludovic Molliex, Magnus Holmquist, and Olivier Sudre. "Oxide/Oxide Ceramic Matrix Composites in Gas Turbine Combustors." In ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/98-gt-030.

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Gas turbine combustor concepts designed to give improved control of NOx emissions require the usage of hot uncooled walls. The main material properties needed in this application include mechanical and chemical stability at temperatures in excess of 1400°C for long times (>10 000 hours). Composites made from single crystal oxide fibre reinforced oxide with a compatible high temperature stable weak oxide interphase are potential candidate materials to meet these requirements. Alumina was chosen as a model material, unidirectional and 2D composites were processed and a suitable weak zirconia interphase was designed. The process was scaled-up to make production of larger panels and components possible. Mechanical testing was carried out at room temperature to characterise the performance of the material in the as produced and thermally aged condition. Room temperature mechanical properties compared well with other current ceramic composites and excellent high temperature stability was demonstrated. The applicability of the composite as a material for uncooled combustor walls is to be further assessed by evaluation in a combustor test rig. Results from computational fluid dynamics and finite element calculations as well as results from combustor rig tests of monolithic and composite ceramic tiles will be presented.
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4

Go¨ring, Ju¨rgen, Bernd Kanka, Martin Schmu¨cker, and Hartmut Schneider. "A Potential Oxide/Oxide Ceramic Matrix Composite for Gas Turbine Applications." In ASME Turbo Expo 2003, collocated with the 2003 International Joint Power Generation Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/gt2003-38836.

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WHIPOX® (Wound Highly Porous Oxide CMCs) are oxide/oxide composites which are composed of highly porous alumino silicate or alumina matrices and of alumino silicate (Nextel 720, 3M) or alumina (Nextel 610, 3M) fibers. The materials are fabricated by a computer-controlled winding technique, developed at DLR. After eventual forming and joining steps, the green prepegs are pressureless sintered in air at 1300°C. The high temperature behavior of the CMCs is mainly controlled by the thermo-mechanical properties of the oxide fibers. For long-term use (>10,000 h) an application limit for the composite of about 1100°C is expected. It can, however, be improved by external thermal barrier coatings up to a maximum surface temperature of 1300°C. Gas burner tests show that the composites are extremely resistant against thermal fatigue. Therefore it is a material with a high potential for the use under the long-term high temperature conditions of gas turbine engines.
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5

More, Karren L., Edgar Lara-Curzio, Peter F. Tortorelli, Tracie M. Brummett, and Andy Szweda. "The High-Temperature Stability of an Oxide/Oxide Composite at High Water-Vapor Pressure." In ASME Turbo Expo 2005: Power for Land, Sea, and Air. ASMEDC, 2005. http://dx.doi.org/10.1115/gt2005-69065.

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The microstructural and mechanical stabilities of a Nextel 720 (alumina+mullite) fiber-reinforced, alumina matrix composite were evaluated following exposure of the material to a high H2O pressure (to simulate a gas turbine combustor environment) in Oak Ridge National Laboratory’s (ORNL’s) high temperature, high pressure facility (Keiser Rigs). Coupons were exposed at 1135°C and 1200°C in a high-pressure (10 atm) furnace containing 10% water vapor for 1000, 2000, and 3000 h. Extensive microstructural characterization was conducted after each exposure to evaluate fiber and matrix stabilities as a function of exposure time and temperature. Retained tensile strengths were also measured and compared to baseline properties following each exposure. It was found that there was no significant change in the composite microstructure or tensile strength after long-term exposure in the Keiser Rig at 1135°C, whereas significant Nextel 720 fiber degradation (grain growth and increased surface roughness) occurred during exposure for 3000 h at 1200°C. Statistical variations in the mean strength values between the as-processed and exposed composites indicated little change in strength, however. The composite degradation was primarily thermal and the addition of H2O had little effect on changing or accelerating these effects.
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6

Choi, Sung R., Donald J. Alexander, and Robert W. Kowalik. "Foreign Object Damage in an Oxide/Oxide Composite at Ambient Temperature." In ASME Turbo Expo 2008: Power for Land, Sea, and Air. ASMEDC, 2008. http://dx.doi.org/10.1115/gt2008-50505.

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Foreign object damage (FOD) behavior of an oxide/oxide (N720/AS) ceramic matrix composite (CMC) was determined at ambient temperature using impact velocities ranging from 100 to 400 m/s by 1.59-mm diameter steel-ball projectiles. Two different support configurations of target specimens were used: fully supported and partially supported. The degree of post-impact strength degradation increased with increasing impact velocity, and was greater in a partially supported configuration than in a fully supported one. For the fully supported configuration, frontal contact stress played a major role in generating composite damage, while for the partially supported case both frontal contact and backside flexure stresses were the combined sources of damage generation. The oxide/oxide composite was able to survive high energy (∼1.3 J) impacts without complete structural failure. The degree of relative post-impact strength degradation of the oxide/oxide composite was similar to that of an advanced SiC/SiC composite observed from a previous study, regardless of the type of specimen support. Like the SiC/SiC composite, impact-damage tolerance was greater in the oxide/oxide than in monolithic silicon nitride ceramics for impact velocities >300 m/s.
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7

Andrada, D. M., T. M. Serodre, A. P. Santos, and C. A. Furtado. "REDUCED GRAPHENE OXIDE AS REINFORCEMENT IN ALUMINIUM NANOCOMPOSITES PREPARED BY POWDER METALLURGY." In Brazilian Conference on Composite Materials. Pontifícia Universidade Católica do Rio de Janeiro, 2018. http://dx.doi.org/10.21452/bccm4.2018.11.01.

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8

Pinto, João P. C., Nancy I. A. Acevedo , and Marisa C. G. Rocha. "Niobium oxide (NB2O5) filled high modulus polyethylene extrudable (HMPEX) composites: tensile properties." In Brazilian Conference on Composite Materials. Pontifícia Universidade Católica do Rio de Janeiro, 2018. http://dx.doi.org/10.21452/bccm4.2018.13.08.

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9

Muzikova, Barbora, Liam Gollino, Radek Zouzelka, Jiri Rathousky, and Thierry Pauporté. "Graphene/TiO2 composite films for efficient photocatalytic degradation of antibiotics in wastewaters." In Oxide-based Materials and Devices XIV, edited by Ferechteh H. Teherani and David J. Rogers. SPIE, 2023. http://dx.doi.org/10.1117/12.2659658.

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Bas, Salih Zeki, Mustafa Ozmen, and Salih Yildiz. "Electrochemical H2O2 sensor based on graphene oxide-iron oxide nanoparticles composite." In 2017 IEEE 7th International Conference "Nanomaterials: Application & Properties" (NAP). IEEE, 2017. http://dx.doi.org/10.1109/nap.2017.8190318.

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Звіти організацій з теми "Oxide composite"

1

SUGAMA, T., R. SABATINI, and K. GAWLIK. SELF-ASSEMBLY CE OXIDE/ORGANOPOLYSILOXANE COMPOSITE COATINGS. Office of Scientific and Technical Information (OSTI), January 2005. http://dx.doi.org/10.2172/15011205.

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Gorte, Raymond J., and John M. Vohs. The Development of Nano-Composite Electrodes for Solid Oxide Electrolyzers. Office of Scientific and Technical Information (OSTI), March 2014. http://dx.doi.org/10.2172/1124583.

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3

Ilwon Kim, Scott Barnett, Yi Jiang, Manoj Pillai, Nikkia McDonald, Dan Gostovic, Zhongryang Zhan, and Jiang Liu. Composite Cathode for High-Power Density Solid Oxide Fuel Cells. Office of Scientific and Technical Information (OSTI), January 2004. http://dx.doi.org/10.2172/882534.

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4

Weber, J. K., J. J. Felten, P. C. Nordine, and W. M. Kriven. Melt Drawing/Coating of Oxide Fibers for Composite Materials Applications. Fort Belvoir, VA: Defense Technical Information Center, March 1996. http://dx.doi.org/10.21236/ada329561.

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Sadykov, Vladislav, Ekaterina Sadovskaya, Yulia Bespalko, Nikita Eremeev, Mikhail Mikhailenko, and Mikhail Korobeynikov. Radiation thermal sintering of oxide and composite materials for hydrogen energy. Peeref, June 2023. http://dx.doi.org/10.54985/peeref.2306p8613414.

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6

Federer, J. I., H. E. Kim, and A. J. Moorhead. Corrosion of SiC and oxide-composite ceramics by a simulated steam-reformer atmosphere. Office of Scientific and Technical Information (OSTI), September 1991. http://dx.doi.org/10.2172/5128601.

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7

Weber, Richard, Waltraud M. Kriven, Paul C. Nordine, Benjamine Cho, and William Jellison. Advanced Oxide Fibers and Coatings for High Temperature Composite Materials Applications. Phase 1. Fort Belvoir, VA: Defense Technical Information Center, October 1997. http://dx.doi.org/10.21236/ada333768.

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Kathy Lu and Jr W. T. Reynolds. Gradient Meshed and Toughened SOEC (Solid Oxide Electrolyzer Cell) Composite Seal with Self-Healing Capabilities. Office of Scientific and Technical Information (OSTI), June 2010. http://dx.doi.org/10.2172/981927.

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Indacochea, J. E., V. K. Gattu, X. Chen, and T. Rahman. Performance of a Steel/Oxide Composite Waste Form for Combined Waste Steams from Advanced Electrochemical Processes. Office of Scientific and Technical Information (OSTI), June 2017. http://dx.doi.org/10.2172/1364135.

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Mahendran, Subramanian, and Rajamani Jeyapaul. Preparation of Aluminium Calcium Oxide Composite Material Using Stir Casting Method and Testing of Its Mechanical Properties. "Prof. Marin Drinov" Publishing House of Bulgarian Academy of Sciences, October 2018. http://dx.doi.org/10.7546/crabs.2018.10.13.

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